It seems eth0 on imx8mq evk auto gets an ip address after booting. But I cannot find /etc/network/interfaces on rootfs and there is no ip=dhcp in bootargs. How does imx8mq evk manage network interfaces? How to disable default eth0 dhcp function?
Thanks
Hi Jheng-Jhong
also one can check linux documentation for ip=none
nfsroot.txt\nfs\filesystems\Documentation - linux-imx - i.MX Linux kernel
Best regards
igor
I had tried, but dhcp still worked
Dear jheng-jhongwu,
You can manage the network configuration using systemd.
To stop using DHCP and define a static ip address:
1. Create a file under /lib/systemd/network folder named 10-eth0.network for example and define your desired configuration:
[Match]
Name=eth0
[Network]
Address=10.0.0.100/24
Gateway=10.0.0.1
2. Restart systemd-networkd service
root@imx8mqevk:~# systemctl restart systemd-networkd.service
3. Verify
root@imx8mqevk:~# ifconfig
eth0 Link encap:Ethernet HWaddr 00:04:9f:05:69:fc
inet addr:10.0.0.100 Bcast:10.0.0.255 Mask:255.255.255.0
inet6 addr: fe80::204:9fff:fe05:69fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST DYNAMIC MTU:1500 Metric:1
RX packets:1691402 errors:0 dropped:0 overruns:0 frame:0
TX packets:93052 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:192346556 (183.4 MiB) TX bytes:15991089 (15.2 MiB)
That's all
If this reply answers your question please mark it as "correct answer".
Regards
Maro
Finally I found I have to disable connman service. Otherwise it will force doing eth0 dhcp.
systemctl disable connman
Thanks a lot!
If you want to go through connman I prefer perform configuration through it rather than disabling it.
In your board run:
# connmanctl services
*AR Wired ethernet_00049f04a748_cable
Then set IP parameters:
# connmanctl config ethernet_00049f04a748_cable --ipv4 manual 192.168.1.100 255.255.255.0 192.168.1.1
Verify, before and after rebooting
#ifconfig
eth0 Link encap:Ethernet HWaddr 00:04:9f:04:a7:48
inet addr:192.168.1.100 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::204:9fff:fe04:a748/64 Scope:Link
UP BROADCAST RUNNING MULTICAST DYNAMIC MTU:1500 Metric:1
RX packets:205 errors:0 dropped:0 overruns:0 frame:0
TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:29641 (28.9 KiB) TX bytes:7822 (7.6 KiB)
I hope this helps you
Regards
Maro
After rebooting, eth0 still gets an IP. I cannot figure out what happened... Specifically, I'd like to not assign any IP to eth0.